Examine source code of Carina Nebula

{
  "manifest_version": 2,
  "version": "1.2",
  "name": "Carina Nebula",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(17, 23, 47, 0.49)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(23, 32, 68)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(104, 78, 62, 0.66)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(123, 84, 61)",
      "popup": "rgb(23, 32, 68)",
      "popup_text": "rgb(215, 226, 239)",
      "popup_border": "rgb(23, 32, 68)",
      "sidebar_border": "rgb(23, 32, 68)",
      "tab_loading": "rgb(123, 84, 61)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4174ee85-849b-469e-b8c5-b982ec0382a9}"
    }
  }
}